Robin EH36BS User manual

CONTENTS
Section Title Page
1 . SPECIFICATIONS ....................................................................................................... 1
2 . PERFORMANCE ........................................................................................................ 3
2-1MAXIMUMOUTPUT ........................................................................................................ 3
2-2 CONTINUOUS RATED OUTPUT .................................................................................... 3
2-3 MAXIMUMTORQUE
....................................................................................................... 3
2-4 PERFORMANCECURVES
............................................................................................. 4
3 . FEATURES .................................................................................................................. 6
4 . GENERAL DESCRIPTION OF ENGINE COMPONENTS .......................................... 7
4-1 CYLINDER AND CRANKCASE ....................................................................................... 7
4-2 MAIN BEARING COVER ................................................................................................. 7
4-3 CRANKSHAFT .................................................................................................................. 7
4-4 CONNECTING ROD AND PISTON ................................................................................. 8
4-5PISTON
RINGS ............................................................................................................... 8
4-6CAMSHAFT ..................................................................................................................... 8
4-7 VALVE ARRANGEMENT ................................................................................................. 9
4-8 CYLINDER HEAD ............................................................................................................ 9
4-9GOVERNORSYSTEM .................................................................................................... 9
4-10 COOLING SYSTEM
..................................................................................................... 10
4-11LUBRICATIONSYSTEM
.............................................................................................. 10
4-12IGNITIONSYSTEM ..................................................................................................... 10
4-13 CARBURETOR
............................................................................................................. 11
4-14 AIR CLEANER
.............................................................................................................. 11
4-1
5 BALANCER ................................................................................................................... 11
4-16DECOMPRESSIONSYSTEM
..................................................................................... 12
4-17 SECTIONAL VIEW OF ENGINE
.................................................................................. 13
5 . DISASSEMBLY AND REASSEMBLY ....................................................................... 15
5-1PREPARATIONSANDSUGGESTIONS ........................................................................ 15
5-2 SPECIALTOOLS
........................................................................................................... 15
5-3 DISASSEMBLYPROCEDURES .................................................................................... 16
5-4 REASSEMBLY PROCEDURES
..................................................................................... 31
5-5 BREAK-INOPERATION ................................................................................................ 43
6. MAGNETO ................................................................................................................ 43
6-1 OPERATIONANDFUNCTION ...................................................................................... 43
6-2 BASICTHEORY ............................................................................................................ 43
6-3 WIRING DIAGRAM ........................................................................................................ 45

Section Title Page
7 . AUTOMATIC DECOMPRESSION SYSTEM ............................................................ 46
8 . CARBURETOR ........................................................................................................ 47
8-1 OPERATION AND CONSTRUCTION ............................................................................ 47
8-2 DISASSEMBLY AND REASSEMBLY ............................................................................. 48
9 . STARTING SYSTEM ................................................................................................ 50
9-1RECOILSTARTER ........................................................................................................ 50
9-2 ELECTRIC STARTER .................................................................................................... 54
10 . TROUBLESHOOTING ........................................................................................... 56
10-1STARTINGDIFFICULTIES .......................................................................................... 56
10-2 ENGINE MISFIRE ........................................................................................................ 57
10-3 ENGINE
STOPS .......................................................................................................... 57
10-4 ENGINE OVERHEAT ................................................................................................... 58
10-5 ENGINE KNOCKS
....................................................................................................... 58
10-6 ENGINE BACKFIRES THROUGH CARBURETOR ..................................................... 58
11 . INSTALLATION ..................................................................................................... 59
11-1 INSTALLING ................................................................................................................. 59
11-2 VENTILATION
.............................................................................................................. 59
11-3 EXHAUSTGAS DISCHARGE
..................................................................................... 59
11-4 POWER TRANSMISSION TO DRIVEN MACHINES
................................................... 59
12 . SERVICE DATA ....................................................................................................... 60
12-1 CLEARANCE DATAAND LIMITS ................................................................................ 60
12-2 TORQUE SPECIFICATIONS
....................................................................................... 66
12-3 OILGRADE CHART .................................................................................................... 66
13 . MAINTENANCEAND STORAGE .......................................................................... 67
13-1 DAILYMAINTENANCE ................................................................................................ 67
13-2 INITIAL 20 HRS . MAINTENANCE ............................................................................... 67
13-3 EVERY
50 HRS . (10 DAYS) MAINTENANCE ............................................................. 67
13-4 EVERY
100-200 HRS . (MONTHLY) MAINTENANCE ................................................. 68
13-5 EVERY 500-600 HRS . MAINTENANCE ...................................................................... 68
13-6 EVERY 100
HRS . (YEARLY) MAINTENANCE ............................................................ 68
13-7 ENGINE STORAGE ........................................... : ......................................................... 68

I EH36 1
MODEL ~~~ ~ ~
EH36B EH36DS EH36D EH36BS
I I I
Type Air-Cooled, 4-Cycle, Single-Cylinder,
Horizontal P.T.O. Shaft, OHV Gasoline Engine
Bore
x Stroke
8.3
Compression Ratio
404 cm3 (24.65 cu.in.)
Piston Displacement
89
x 65 mm (3.50 x 2.56 in.)
Continuous 6.3
kW (8.5 HP) /3600 r.p.m. 6.3 kW (8.5 HP) /I800 r.p.m.
output Max. 8.5 kW (1 1.5
HP) /3600 r.p.m.
8.5 kW
(1 1.5 HP) /1800 r.p.m.
~
Max. Torque 54.9
N - m (5.60 kgf - m)
/1250 r.p.m. 27.4
N - m(2.80kgfm)
/2500 r.p.m.
I
Direction of Rotation 1 CounterclockwiseAsViewedFromP.T.O. Shaft Side I
____~
Cooling system
Valve Arrangement
Forced Air Cooling
Automobile Oil SAE
#20, #30 or 1OW-30 ; Class SE or higher
Lubricant
Splash Type Lubrication
Overhead Valve
~_____
Capacity of Lubricant 1.2 liters (0.32 U.S. gal.)
Carburetor
I HorizontalDraft,FloatType
Fuel
Fuel Tank Capacity
Gravity Type
Fuel Feed System
31
0 g/kW - h (230 g/HP - h) At Continuous Rated Output Fuel Consumption Ratio
Automobile Unleaded Gasoline
7.0 liters
(1.85 U.S. gal.)
IgnitionSystem
I FlywheelMagneto(SolidState) I
Spark Plug NGK BP6ES
Charging Capacity
-
-
1/2 Camshaft Drive
Speed Reduction
Starting System
12V-1.3A
-
1 2V- 1.3A
Governor System Centrifugal Flyweight Type
Air Cleaner Double Element Type
Recoil Starter
& Recoil Stafler
& Recoil Starter
Recoil
Starter
Electric Starter
Electric Starter
Dry Weight
I 32.0 kg (70.6 Ib.) I 35.0 kg (77:2 Ib.) I 31 .O kg (68.4 Ib.) I 34.0 kg (75.0 Ib.)]
~_____
Dimensions (L x W x H)
389 mm x 431 mm x 433 mm (15.31 in. x 16.97 in. x 17.05 in.)
I
Specifications aresubject to change without notice.
- 1-

EH41 I
MODEL
EH41B EH41
DS
EH41 D EH41BS
Air-Cooled, 4-Cycle, Single-Cylinder,
Horizontal P.T.O. Shaft, OHV Gasoline Engine
I Bore x Stroke
89 x 65 mm (3.50 x 2.56 in.)
btonbisplacement 404 cm3 (24.65 cu.in.)
1
EmpressionRatio
~~
8.3 I
Continuous 7.0 kW
(9.5 HP) 13600 r.p.m.
7.0 kW
(9.5 HP) /1800 r.p.m.
Output
Max.
9.9 kW (13.5 HP) /3600 r.p.m. 9.9 kW (13.5 HP) /1800 r.p.m.
,
Max. Torque 56.8
N m (5.80kgf - m)
I
28.4 N - m(2.90kgfm)
/1250r.p.m.
/2500 r.p.m.
Direction
of Rotation
Cooling system
Counterclockwise
As Viewed From P.T.O. Shaft Side
Splash Type
Lubrication
Overhead Valve
Valve Arrangement
Forced Air Cooling
(Lubricant
I AutomobileOil SAE #20,#30or low-30 ; Class SE or higher I
Capacity of Lubricant
310 g/kW
- h (230 g/HP - h) At Continuous Rated Output
Fuel Consumption Ratio
Automobile Unleaded Gasoline
Fuel
Horizontal Draft, Float Type
Carburetor 1.2 liters (0.32
U.S. gal.)
/
7
I Fuel Feed System
T~- GravityType
1 7.0liters(1.85 US. gal.)
Ignition System
Spark Plug
Flywheel Magneto (Solid State)
12V-1.3A 12V-1.3A
-
Charging Capacity
NGK
BPGES
Starting System
Speed Reduction 1/2 Camshaft Drive
-
Governor System Centrifugal Flyweight Type
Air Cleaner Double Element Type
Electric Starter
& Recoil Starter
Recoil Starter
& Recoil Starter
Recoil Starter
Electric Starter
Dry Weight
Dimensions
(L x W x H) 389 mm x 431 mm
x 433 mm (1 5.31 in. x 16.97 in. x 17.05 in.)
~ ~~
32.0 kg (70.6 Ib.)
34.0 kg (75.0 Ib.)
31.0 kg (68.4
Ib.) 35.0 kg (77.2 Ib.)
Specifications are subject to changewithout notice. /"
- 2-

2. PERFORMANCE
2-1 MAXIMUM OUTPUT
The maximum output is the output ofanengine with its throttle valve fully opened under the condition that
all the moving parts are properly brokeninafter theinitial break-in period.
A new engine may not produce full maximum output whileitsmoving parts are still not broken-in.
NOTE :
Power curves showninthe following charts are madeinconformity with SAE internal combustion engine
standard test code
J 1349.
2-2 CONTINUOUS RATED OUTPUT
The continuous rated output is the outputof an engine at optimum governed speed whichis most favor-
able from the view pointof engine'slife and fuel consumption.
When the engine is installed on a certain equipment, it is recommendedthat the continuous output
required from the enginebe kept below this continuous rated output.
2-3 MAXIMUM TORQUE
The maximum torqueisthe torqueat the output shaft when the engine is producing maximum output at
certain revolution.
- 3-

2-4 PERFORMANCE CURVES
EH36
( ) for type B
t
kgf-m
(5.6) 2.8
(5.4) 2.7
(5.2) 2.6
!!j (5.0) 2.5
(4.8) 2.4
(4.6)
2.3
(4.4)2.2
HP
12
11
10
9
8
7
6
5
4
3
Nom
:54) 27
:52) 26
:50) 25
:48) 24
:46) 23
(44) 22
kW
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0 24
(12) 28 (1
4)
32
(1 6)
36
(1 8)
REVOLUTION r.p.m.
- 4-

EH41
kgfom
(5.8) 2.9 1
w (5.6)2.8
-
(5.2) 2.6
I-
HP
14
13
12
11
10
9
8
7
6
5
4
3
( for tvpe B
Nom
(56) 28
(54) 27
(52) 26
kW
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
20 24 28 3236 x10 ’
(10) (12)(14) (16) (18)
REVOLUTION r.p.m.
- 5-

1. The overhead valve design offers a compactness,lightweight and ideal combustion characteristics
resulting in more power from lessfuel and prolonged engine life.
2. The adoptionof an inclined cylinder offers low height of engine, makingthearrangements for installing
the engine much easier for various powered equipments.
3. The vibration, free design with a balancer system and lighter reciprocating parts.
4. Combustion and mechanicalnoises have been analized acoustically and improved for bettertonal
quality and lower engine noise.
5. The automatic decompression system lightensthe recoil pull forceby 50% comparing to the conven-
tional
SV engine.
- 6-

4. GENERAL DESCRIPTION OF ENGINECOMPONENTS
4-1 CYLINDERANDCRANKCASE
The cylinder and crankcase is a single piece alu-
minum die-casting.
The cylinder liner, made of special cast iron, is
molded into the aluminum casting.
The crankcase has a mounting surface on the out-
put shaft side, where the main bearing cover is
attached.
I
Fig. 4- 1
4-2 MAIN BEARING COVER
The main bearing coverisanaluminum die-cast-
ing, whichis mountedonthe output shaft sideof
the crankcase.
Remove the main bearing coverto inspect inside
e of the engine.
Pilots and bosses are machined
on the cover for
direct mounting
of the engine onto such machines
as generators and pumps.
Oil gauges (fillers) are on both sidesof the cover
for easy maintenance.
I OilGAUGE
-
Fig. 4-2
4-3 CRANKSHAFT
The crankshaft is forged carbon steel, and the
crank pinis induction-hardened.
The output end
of the shaft has a crankshaft gear
and balancer gear thatare pressed into position.
Fig. 4-3
- 7-